Calculated by taking the carry distance for a ball and dividing it by the cost of the ball. For an 85 mph swing , the Pro V1 carries 191.2 yards. Therefore, 191.2/55 = 3.47 yards per dollar. More balls and more swings will be added.

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Relevant info:

All included balls are urethane.

Each table is for a particular swing speed using driver: 85, 100, 115 mph swings

Data derived from a robot experiment. 

The cost is sourced from the brand's official site (if a ball is no longer sold on their site, it was left off the list).